Dr. Hisham K. Hamadeh is a research scientist at Amgen. He earned his Ph.D. in toxicology from the University of California at Irvine, following up as a research fellow in the National Center for Toxicogenomics Microarray Center, NIEHS. He has received research excellence awards from the Society of Toxicology and American Cancer Society.

Dr. Cynthia A. Afshari is Associate Director of Toxicology at Amgen. She has served as Director of Basic Research Applications at the Microarray Center and Head of the Gene Regulation Group, Laboratory of Molecular Carcinogenesis, NIEHS. She has also held a position as adjunct professor for the Curriculum in Toxicology at the University of North Carolina, Chapel Hill.